diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b1c5643..bbb7091 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,6 +13,8 @@ jobs:
     defaults:
       run:
         shell: bash
+    env:
+      CXX: ${{matrix.platform.env}}
 
     strategy:
       fail-fast: false
@@ -22,8 +24,8 @@ jobs:
         - { name: Windows ClangCL, os: windows-latest, flags: -T ClangCL }
         - { name: Windows Clang,   os: windows-latest, flags: -GNinja -DCMAKE_CXX_COMPILER=clang++ }
         - { name: Linux GCC,       os: ubuntu-latest }
-        - { name: Linux Clang,     os: ubuntu-latest, flags: -DCMAKE_CXX_COMPILER=clang++ }
-        - { name: macOS GCC,       os: macos-latest, flags: -DCMAKE_CXX_COMPILER=g++-12 }
+        - { name: Linux Clang,     os: ubuntu-latest, env: CXX=clang++ }
+        - { name: macOS GCC,       os: macos-latest, env: CXX=g++-12 SDKROOT=/Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk/ }
         - { name: macOS Clang,     os: macos-latest, flags: -GXcode }
         type:
         - { name: Shared, flags: "ON" }